/*
 * Copyright 2004 original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.jbfilter.jsp;

import java.text.SimpleDateFormat;

import javax.servlet.jsp.JspException;

import org.jbfilter.impl._JbFilterDateUtils;

public class DateTagUtils {
	
	public static SimpleDateFormat getDateFormat(String pattern, JbfilterTag tag) throws JspException {
		try {
			return _JbFilterDateUtils.getSimpleDateFormat(pattern);
		} catch (IllegalArgumentException e) {
			throw new JspException(
					new StringBuilder().
					append("Invalid attribute '").
					append(JbfilterTagAttribute.pattern).
					append("' in tag '").
					append(tag).
					append("' : '").
					append(pattern).
					append("'.").toString());
		}
	}
}
